为了分析轴流泵在马鞍区工况的内部流动特性，对比转速为822轴流泵的内流场进行数值模拟和分析，并对外特性进行试验测试。研究结果表明：扬程模拟值与实验值误差均在1%以内，效率模拟值与实验值误差均在2个百分点以内；0.6QBEP工况叶片压力面静压力分布不均匀，较最优工况从叶片进口到出口静压力的压力梯度明显增大，在吸力面出现了较大面积的低压区，0.55QBEP工况叶片压力面靠近轮缘的高压区较0.6QBEP的工况时明显增大，吸力面从叶片进口到出口静压力逐渐增大；最优工况下叶片压力面和吸力面涡量螺旋度Hn分布较均匀，马鞍区内叶片吸力面和压力面存在明显的旋涡集中区；马鞍区内叶轮进口靠近前缘侧出现回流，叶轮出口靠近轮毂处产生明显旋涡。

In order to analyze the running characteristics of axial flow pump in saddle zone，the internal flow field of the axial flow pump with ns = 822 is simulated and analyzed. The external performance was tested by experiment. The results show that the difference of head simulation value and experimental value is less than 1%, the difference of efficiency simulation and experiment value is within 2 percentage points. Under the condition of 0.6QBEP，the static pressure distribution of blade pressure surface is not uniform. The pressure gradient of static pressure from impeller inlet to outlet gradually increases. Low pressure appears on the suction surface. Under the condition of 0.55QBEP, the static pressure from blade inlet to outlet gradually increases. Under the optimal conditions, the vorticity helix Hn distribution on blade pressure surface and suction surface is uniform. There is a significant vortex concentrated area in the suction surface and pressure surface. The impeller inlet near the front edge in the saddle area appears back flow and the impeller outlet close to the hub has clear vortexes. The research results can provide a reference for the optimization of the unstable operation characteristics of axial flow pump.